Why won't iphone connect to macbook on ad hoc wifi

Before updating to iOS 5.1 I had no problem connecting to my macbook via an ad hoc network. Now the iPhone recognizes the network and the after choosing the network in settings it appears to be connected. However, there is no indication of a connection in the menu bar and I am unable to connect with the macbook to sync programs that do not sync through iTunes, or share the wired internet connection of the macbook.

You're welcome
Most routers have unstable DHCP server daemons (that's the software that assigns IP addresses to devices when they connect) that occasionally die. By power cycling the router you restart the DHCP server in the router.

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